Tubular netting



Ma 22, 1945., H EHLER 2,376,442 TUBULAR NETTING l Filed July '7, 1945 INVENTOR. Hugo MEHLEZ Patented May 22, 1945 TUBULAR NETTING Hugo Mahler, Churchville, Pa. Application J uly 7, 1943, Serial No. 493,704 M 2. Claims.

This invention relates to tubular netting, and, while the netting provided hereby may meet with widespread use whenever the problem of lowering objects is presented, the invention is concerned primarily with the lowering of dynamite or other explosive charges in drill holes." i

For many years, the proposition of lowering dynamite in drilled bores has presented difficulties and problems, which those associated with this art have attempted to solve, Many times these bores are drilled to great depths, "and, due to the conditions encountered in drilling, the bores are not always uniform in diameter and accurately vertical. With the packaging methods heretofore available, the dynamite, or explosive charge has often caughtin restricted portions of the bore or at bends therein. Manytimes this catching has been so pronounced as to prevent removal of the charges even when attempt is made to pull them out.

For many years, those skilled in thisart have appreciated these problems and attempted to solve them. Up to the advent of this invention, it is believed that the closest approach to a proper solution of the problem is the explosive package provided by Johnson in his patent, No. 2,138,603, dated November 29, 1938. In accordance with the teachings of this patentee, a tubular web or netting is provided as the container for the explosive charges, and the patentee Johnson indicates that further than the Johnson patent, and provide a tubular netting which is highly improved for the uses required thereof, as compared to the fish net of Johnson. A fish net is made by crossing yarn, twine or cord and forming knots at the intersections whereby meshes are formed. The intended purpose of the knotting is to maintain constant the size of the meshes. With present-day methods of manufacture, the fish nets are produced in flat form and must, subsequently, be fashioned into the tubular form required of an explosive package. With the knots present in a tubular netting designed to contain explosive charges, roughened interior and exterior surfaces are presented. Thus, when the netting is to be snugly filled, the knots constitute an impediment to the slipping in of the, dynamite sticks. Furthermore, the outward protruding of the knots give rise to the strong possibility that they may catch on the sides of the drilled bores. This likelihood is particularly emphasized at restricted portions'of the bores or where the bores are de- 10 ace to movement of the package in the" bore;

tered.

5 weaken or loosen the knots.

the size of the meshes is enlarged and there is a formed out of the vertical. In some instances, the catching of this knotted package structure will in itself prevent lowering of the charge. cases, the catching might be just sufficient to When this occurs,

tendency for the dynamite sticks to either fall out of the package or partially lean outthro'ugh the enlarged mesh and thereby constitute a menis made to withdraw the package from the bore,

it is evident that great difiiculties will be encoun- With the foregoing conditions i mind, this i vention has in view, as its foremost objective, the provision of a tubular netting having meshes of fixed size and substantially smooth interior and exterior surfaces.

woven crossings or intersections.

A further object of the invention is they provi-.

sion of a tubular netting of the character aforesaid which may be made directly in its tubular form on a highly developed Jacquard braiding machine. This materially reduces the cost'of manufacture, as it eliminates the necessity of fashioning the tubular structure from fiat or sheet material.

With a tubular netting including the woven joints or crossings, a high degree of smoothness is 40 thereby enlarging the size of any mesh.

1,; eter, size of mesh, strength and smoothness.

A further object of the invention is the provision of a tubular netting of the type abovenoted which is substantially uniform in diamnetting containing this uniformity is particularly adapted to the lowering of dynamite or other explosive charges, as it completely eliminates the possibility of the charge from falling or leaning out of the net, and, at the same time, reduces to an absolute minimum the possibility of the filled netting from catching in the drilled holes.

A tubular netting made in accordance with the above-noted ideas presents the further decided advantage of being susceptible of production at a cost that is only a fraction of the cost of manu- NT- OFFICE In other with carrying out the above-noted thoughts in a practical embodiment, will in partbecome apparent and in part be hereinafter stated, as a description of the invention proceeds.

The invention, therefore, comprises a tubular netting which is made as a seamless tube, and

which is characterized as including braided links and woven joints.

For a full and more complete understanding.

of the invention, reference may be had to the following description and accompanying drawing,

wherein:

Figure 1 is a. perspective of an explosive pack. age including the tubular netting provided by this invention.;.:and-.

Fi'gure- 2 is an enlargedxietailed View showin the'threads of -the braided links and woven joints in distend'ed, relation.

.Referring now 170 the drawing, whelcein like referencelchflracters-denobe corresponding Paazfis, and 13331: more. particularly so Figure 1,- the tubjarlalr netting provided- 'byflahis: invention is identified in its entirety by the. reference character N. A stick oi dynamite or other explosive charg is depicted c at r l and is shown .as-being containedwithin: the netting N,. The. latter may be. knotted. at. both endscas shown ati i' and. I2 to close the tube. and insure. that the explosive charge l0 remains therein. Referring; now more'particularly to Figure. 2, it will" be noted that the netting; end comprises a plurality of linksLandjoints J'. The links L are braidedand it is obvious that the number of threads. employed in-the braid may .be. varied to accommodate any-particular conditions... In the form of the invention illustrated inthe drawings, thelink L is shown as comprising four strands i3, l4, l5 and I6, which are braided into the braided construction depicted. ,When. the. joint Jis. reached, the links l3, l4, I5-and lfi' are no longer. braided together, but are. wovenin With the corresponding strands of the link which isv being crossed.v 3 Thisv structurecomprising. the braided. links L and woven joints J may be made on a highly developed Jacquard braiding machine. One of these machines may be adjusted to accommodate a varying number of strands within a wide range, and also may be adjusted to vary the size of the meshes Within a wide range.

Given the size and weight of any object which is to be lowered by the tubular netting, this netting may be produced with definite assurance that it willperiormthe job required of it. The size of' the meshes is definitely fixed? by the woven joint, and, by allowing an appropriate margin for safety, the meshes may be made just so large as to definitely insure that the article will not pass therethrough. Furthermore, the strength of the links may be definitely predetermined to give assurance that the weight will be adequately accommodated. Thus, While the tubular netting of this invention is designed primarily for the lowering of explosive charges, it is susceptible of. being. produced tQ-meet. other uses.

While. a. preferred specific ernbpdiment of the invention is. hereinblefzore set" forth, it... is tocbe cleaxly Understood. that the invention is not'to be limited tothe exact. constructions illustrated and described, because various modifications. of these details may be r vided in. putting tlme irivention into practice, within the purview of the appended claims.

What is claimed is:

l. A tubular netting comprising linksand joints definingmeshes, said links andjoints. being, made from at least three. strands which are. braided together to. form the links, with. all the strands of. the linksextending in one direction wovenin with allthe strands of the links extending in. the other. direction and continuing in substantially the. same straight line. through. aseries. ofthe wovenjoints. I

2. A seamless tubular netting Comprising links and joints definingfixedv meshes, each of said links including at least three strands that. are

. braided together, each of said joints comprising all the strands of one link that are woven in with all the strands. of a crossing link, and in. which all. the strands of one linkcontinue in substan-. tially the. same straight line through the series of links and woven joints which lie in thatline.

HUGO MEHLERI 

